Device for boring axially-curved holes.



F. A. CLOSE.

DEVrCE FOR BORING AXIALLY CUHVED HOLES.

APPLlcATloN FILED JAN. 15. |916.'

L223,938. Patented Apr. 24, 1917.

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UNTTE STATE@ PATENT CFFTCF.

FRED A. CLOSE, 0F 'UNIONTOW N, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO GEORGE W. DUNHAM, OF' DETROIT, MICHIGAN.

:DEVCE FOR BORNG AXIALLY-CURVED HOLES.

specification of Letters Patent.

Patented Apr. 24, 19T?.

Original application iled September 13, 1915, Serial No. 50,331. Divided and this application filed January To all whom t may concern.'

Be it known that l, Fano A. CLosn, a citizen of the United States of America, residing at Uniontown, in the county of Fayette and State of Pennsylvania, have invented certain new and useful Tmprovements in Devices for Boring Axially-Curved Holes, of which the following is a specification, reference 1seing had therein to the accompanying drawings.

The invention relates to tools particularly designed for use in the formation of curved holes, and comprises the novel Construction as hereinafter set forth.

Tn the drawings:

Figure l is a perspective view of the tool;

Fig. 2 is a section through an axle spindle showing a preliminary operation before using the tool;

Fig. 3 is a similar view showing the toolv in use; and

Fig. a is a diagram illustrating the operation of the tool.

My improved tool is particularly designed for cutting away angles in intersecting angular hores so as to produce a connecting curve to which said angular bores are tangent. ln various mechanical constructions such bores are useful, but the specific illustration is an axle spindle and the formation of a curved bore therein for a speedometer drive.

Preliminary to the operation of my tool, intersecting angular hores are formed by straight drills, and as shown A is a loore extending axially of the spindle B, and C is an angular loore adjacent to the pivot of the spindle, which at its inner end intersects with the bore A, forming the angle D. The tool comprises a reamer E having a tapering smooth nose F at its forward end and Serial No. 72,202.

at its rear end connecting with a flexible drive-shaft Cr formed of short links H alternately transversely pivoted to each other and Connected to a shank l serving as a drive shaft. This tool may be inserted into one of the bores such as C, and pressed inward until the smooth nose F bears against the wall of the axial bore A. The shank is then driven and pressed inward, which will result in causing the reamer E to cut away the inner angle and to produce a Curve, the radius of which is determined by the length of the reamer and the angle of the bores.

What T claim as my invention is l. A curve-boring tool, comprising a short length reamer having a smooth tapering nose, and a fle 7ilo-le shaft directly forming the shank of said reamer and adapted to impart a driving torque and longitudinal thrust thereto.

Q. A curve-boring tool, comprising a short length reamer having a tapering nose, a straight rigid shank and a connection hetween said reamer and shank allowing universal motion of the former, relative to the latter.

3. er curve-boring tool, comprising a short length reamer having a tapering nose, a shank constituting a drive-shaft for said reamer and a plurality of links forming the driving connection between the reamer and said shank, said connection allowing the axis of the reamer to assume various angular relations with that of the shank.

In testimony whereof aiiix my signature in presence of two witnesses.

FRED A. CLOSE.

Witnesses:

JOHN C. RrnsrNonR, J. H. KoMnNsKY.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

